Auld Style an New Style dates

Auld Style (A.S.) an New Style (N.S.) are terms whiles uised wi dates tae indicate that the calendar convention uised at the time descrived is different frae that in uise at the time the document wis bein written. Thare war twa calendar cheenges in Great Breetain an its colonies, that mey whiles complicate matters: the first cheenge wis tae cheenge the stairt o the year frae Leddy Day (25 Mairch) tae 1 Januar; the seicont wis tae discard the Julian Calendar in favour o the Gregorian Calendar.[1][2][3]

↑Stockton, J.R. Date Miscellany I: The Old and New Styles "The terms 'Old Style' and 'New Style' are now commonly used for both the 'Start of Year' and 'Leap Year' [(Gregorian calendar)] changes (England & Wales: both in 1752; Scotland: 1600, 1752). I believe that, properly and historically, the 'Styles' really refer only to the 'Start of Year' change (from March 25th to January 1); and that the 'Leap Year' change should be described as the change from Julian to Gregorian."

↑Spathaky, Mike Old Style and New Style Dates and the change to the Gregorian Calendar. "Before 1752, parish registers, in addition to a new year heading after 24th March showing, for example '1733', had another heading at the end of the following December indicating '1733/4'. This showed where the Historical Year 1734 started even though the Civil Year 1733 continued until 24th March. ... We as historians have no excuse for creating ambiguity and must keep to the notation described above in one of its forms. It is no good writing simply 20th January 1745, for a reader is left wondering whether we have used the Civil or the Historical Year. The date should either be written 20th January 1745 OS (if indeed it was Old Style) or as 20th January 1745/6. The hyphen (1745-6) is best avoided as it can be interpreted as indicating a period of time."